MCQ. A ship sends ultrasound that returns from the seabed and is detected after 3.42 s. If the speed of the ultrasound through seawater is 1300 ms-1, then the distance of the seabed from the ship would be

3000 m

2600 m

2200 m

2800 m

B

MCQ. The speed of sound in solids is

10 times that in gas

20 times that in gas

5 times that in gas

15 times that in gas

D

MCQ. Humans can hear sound up to the highest frequency of 20,000 Hz. If the wavelength of sound in air at this frequency at temperature of 20° would be